Polyurea Joint Sealant

A polyurea joint sealant is a two-component, high-solids elastomeric material that seals concrete joints against moisture, debris, and contaminant infiltration while remaining flexible enough to accommodate thermal expansion and contraction. Semi-rigid joint fillers protect joint edges from wheeled traffic first and foremost. A joint sealant, by contrast, prioritizes long-term flexibility and watertight performance in environments where joint movement is significant.

HTS Chemical manufactures PE-45, a polyurea sealant with a Shore A 50 hardness that delivers the ideal balance of flexibility and durability for concrete joint sealant applications. PE-45 is an aromatic, rapid-setting, self-leveling formula that achieves traffic-ready cure in just 30 to 90 minutes depending on ambient conditions. It is a high-solids formula (95% solids) with zero VOCs that cures rapidly and remains flexible even in sub-freezing temperatures. PE-45 can be applied at temperatures from 20°F to 135°F. PE-45 is USDA and FDA compliant, making it safe for use in food-processing, food-storage, and pharmaceutical environments.

A semi-rigid joint filler (PE-65, PE-85, PE-90) protects joint edges from spalling under heavy traffic by filling the joint with a firm, durable material. A flexible joint sealant like PE-45 accommodates joint movement while maintaining a watertight seal. The choice depends on the joint type: control joints and construction joints in interior warehouse floors typically get a semi-rigid filler, while expansion joints, exterior slabs, and cold-storage joints typically require a flexible sealant. See Technical Bulletin TB-5 for detailed guidance on filler vs sealant selection.

Polyurea joint sealants are used wherever concrete joints need protection from moisture, chemicals, and debris. Food and beverage processing facilities rely on PE-45 to seal joints against bacteria-harboring contamination. The USDA/FDA compliance and flush finish make it ideal for sanitary environments. Cold-storage and freezer facilities use PE-45 because it remains flexible at sub-zero temperatures where other sealants become brittle and crack, allowing moisture and contaminants to penetrate the joint.